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1Fundaci�n
de Investigaci�n M�dica Marshfield Medical, Marshfield, WI 2Salud Canada, Ottawa, Ontario Quiero agradecer a mis co-autores: Tye Arbuckle, Epidemi�logo; y Po Chyou, Bioestad�stico. Traducci�n realizada por Dr. Nicol�s Padilla, Facultad de Enfermer�a y Obstetricia de Celaya, Universidad de Guanajuato, M�xico Original lecture |